Sequence Current Calculator, Formula, Sequence Current Calculation

Sequence Current Calcuator:

Enter the values of voltage, V_seq(V) and impedance, Z_seq(Ω) to determine the value of Sequence current, I_seq(A).

Sequence Current Formula:

Sequence current refers to the components of an unbalanced three-phase system, which can be decomposed into three sets of balanced phasor components: positive sequence, negative sequence, and zero sequence.

In power system analysis, symmetrical components are used to decompose unbalanced phasors into three sets of balanced phasors: positive sequence, negative sequence, and zero sequence components.

These are the voltages associated with each sequence component. V_seq can be positive sequence voltage, negative sequence voltage or zero sequence voltage.

These are the impedances corresponding to each sequence component. Z_seq can be positive sequence impedance, negative sequence impedance or zero sequence impedance.

Positive Sequence represents the balanced condition where the phases are in the normal order (A-B-C).

Negative Sequence represents the condition where the phases are in reverse order (A-C-B).

Zero Sequence represents the condition where all three phases are in phase with each other. The sequence current is calculated using Ohm’s law applied to each sequence component.

Sequence current, I_seq(A) in amperes is calculated by voltage, V_seq(V) in volts divided by impedance, Z_seq(Ω) in ohms.

Sequence current, I_seq(A) = V_seq(V) / Z_seq(Ω)

I_seq(A) = sequence current in amperes, A.

V_seq(V) = sequence voltage in volts, V.

Z_seq(Ω) = impedance in ohms, Ω.

Sequence Current Calculation:

1. Calculate the sequence current for a circuit with a voltage of 100 volts and an impedance of 20 ohms.

Given: V_seq(V) = 100V, Z_seq(Ω) = 20 Ω.

Sequence current, I_seq(A) = V_seq(V) / Z_seq(Ω)

I_seq(A) = 100 / 20

I_seq(A) = 5A.

2. Suppose a sequence current of 2 amperes flows through a circuit with an impedance of 15 ohms. Calculate the voltage.

Given: I_seq(A) = 2A, Z_seq(Ω) = 15 Ω.

Sequence current, I_seq(A) = V_seq(V) / Z_seq(Ω)

V_seq(V) = I_seq(A) * Z_seq(Ω)

V_seq(V) = 2 * 15

V_seq(V) = 30V.

Effect of Negative Sequence Current | Motor Heating Problem | Motor Unbalance Current: